I'm a new for Odoo and keep learning odoo by cookbook .  This my py file 
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from datetime import date, datetime, timedelta 

from odoo import api, fields, models, SUPERUSER_ID, _

from odoo.exceptions import UserError

from odoo.tools import DEFAULT_SERVER_DATE_FORMAT, DEFAULT_SERVER_DATETIME_FORMAT


class CenterEquipment(models.Model):    

_name = 'center.equipment'    

_description = 'Center Branch'
name = fields.Char('Center Name', required=True, translate=True)   

sequence_number = fields.Char('sequence', default=0)    

electronic_devices = fields.Integer('Electronic Devices', default=0)    

office_equipment = fields.Integer('Office Equipment', default=0)    

total_equipment = fields.Integer('Total Equipment', default=0)

and this's my xml :

<!-- Kanban -->    

<record id="center_equipment_kanban_view" model="ir.ui.view">

<field name="name">center.equipment.kanban</field>            

<field name="model">center.equipment</field>            

<field name="arch" type="xml">                

<kanban>                    

<field name="name"/>                    

<field name="electronic_devices"/>                    

<field name="office_equipment"/>                    

<field name="total_equipment"/>                    

<templates>                        

<t t-name="kanban-box">                            

<div t-attf-class="oe_kanban_global_click">                                

<div>                                    

<strong><field name="name"/></strong>                                    

<button><t t-esc="#"/> Request  </button>                                    

<field name="electronic_devices"/> 

<field name="office_equipment"/> 

<field name="total_equipment"/>                               

</div>                            

</div>                       

</t>                   

</templates>                

</kanban>            

</field>    

</record>  

This's my action for kanban view :

<record id="center_equipment_action_view" model="ir.actions.act_window">        

<field name="name">center.equipment.action</field>        

<field name="res_model">center.equipment</field>        

<field name="view_model">kanban,form</field>        

<field name="view_id" ref="center_equipment_kanban_view"/>        

<field name="help" type="html">           

 <p class="o_view_nocontent_smiling_face">                

Add a new Center            

</p>        

</field>    

</record> 

 I can't understand when i add a <menuitem> with action ref="center_equipment_action_view"  The kanban not display, Its just only Tree view show up ???